A close examination revealed that the sandstone was compromised by decades of relentless emissions and by early restoration attempts that might have used sandblasting or heavy chemicals. In addition, the mortar was so deteriorated that the entire building would have to be repointed.
Restoration contractor WASCO Inc. treated the sandstone with a stone hardener, patched the damaged areas, tuckpointed, cleaned the surface, and applied a water resistant coating.
Restoration Contractor: WASCO Inc., Nashville, Tenn.
Suppliers: PROSOCO Inc., Lawrence, Kan.; Cathedral Stone Products; Hanover, Md.